package com.yihu.cms.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtil {
	private static final int QRCOLOR = 0xFF000000;   //默认是黑色
    private static final int BGWHITE = 0xFFFFFFFF;   //背景颜色
    private static int wh430 = 430;
    private static int wh1280 = 1280;
    private static int magin430 = 30;
    private static int magin1280 = 90;
    public static void main(String[] args) throws WriterException  
    {  
        try  
        {  
            //getLogoQRCode("https://www.baidu.com/", "跳转到百度的二维码");
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    } 
    
	/**
    * 生成带logo的二维码图片
    *
    * @param qrPic
    * @param logoPic
    */
   public static BufferedImage getLogoQRCode(String qrUrl,String productName,String logoPath,int type)
   {
    //String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
       //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好
       String filePath = logoPath;  //TODO  
       String content = qrUrl;
       try
       {  
           QRCodeUtil zp = new QRCodeUtil();
           BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, wh430, wh430, zp.getDecodeHintType());
           return zp.addLogo_QRCode(bim, new File(filePath), new LogoConfig(), productName,type);
       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
       return null;
   }
   
   /**
    * 生成带logo的二维码图片
    *
    * @param qrPic
    * @param type : 0不绘制Logo，1绘制logo
    * @param logoPic
    */
   public static BufferedImage getLogoQRCode(String qrUrl,String productName,String logoPath,int w,int h,int type)
   {
    //String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
       //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好
       String filePath = logoPath;  //TODO  
       String content = qrUrl;
       try
       {  
           QRCodeUtil zp = new QRCodeUtil();
           BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, w, h, zp.getDecodeHintType());
           return zp.addLogo_QRCode(bim, new File(filePath), new LogoConfig(), productName,type);
       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
       return null;
   }


   /**
    * 给二维码图片添加Logo
    *
    * @param qrPic
    * @param logoPic
    */
   public BufferedImage addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName,int type)
   {
       try
       {
           /**
            * 读取二维码图片，并构建绘图对象
            */
           BufferedImage image = bim;
           Graphics2D g = image.createGraphics();

           /**
            * 读取Logo图片
            */
           BufferedImage logo = ImageIO.read(logoPic);
           /**
            * 设置logo的大小,本人设置为二维码图片的20%,因为过大会盖掉二维码
            */
           int widthLogo = logo.getWidth(null)>image.getWidth()*3/10?(image.getWidth()*3/10):logo.getWidth(null), 
               heightLogo = logo.getHeight(null)>image.getHeight()*3/10?(image.getHeight()*3/10):logo.getWidth(null);

           /**
            * logo放在中心
            */
            int x = (image.getWidth() - widthLogo) / 2;
            int y = (image.getHeight() - heightLogo) / 2;
            /**
            * logo放在右下角
            *  int x = (image.getWidth() - widthLogo);
            *  int y = (image.getHeight() - heightLogo);
            */

           //开始绘制图片 ,如果type》0绘制logo图片
            if(type>0)
            	g.drawImage(logo, x, y, widthLogo, heightLogo, null);
           g.dispose();

           //把商品名称添加上去，商品名称不要太长哦，这里最多支持两行。太长就会自动截取啦
           if (productName != null && !productName.equals("")) {
               //新的图片，把带logo的二维码下面加上文字
               BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
               Graphics2D outg = outImage.createGraphics();
               //画二维码到新的面板
               outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
               //画文字到新的面板
               outg.setColor(Color.BLACK); 
               outg.setFont(new Font("宋体",Font.BOLD,15)); //字体、字型、字号 
               int strWidth = outg.getFontMetrics().stringWidth(productName);
               if (strWidth > 399) {
//                 //长度过长就截取前面部分
//                 outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
                   //长度过长就换行
                   String productName1 = productName.substring(0, productName.length()/2);
                   String productName2 = productName.substring(productName.length()/2, productName.length());
                   int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
                   int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
                   outg.drawString(productName1, 200  - strWidth1/2, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 );
                   BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
                   Graphics2D outg2 = outImage2.createGraphics();
                   outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
                   outg2.setColor(Color.BLACK); 
                   outg2.setFont(new Font("宋体",Font.BOLD,15)); //字体、字型、字号 
                   outg2.drawString(productName2, 200  - strWidth2/2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight())/2 + 5 );
                   outg2.dispose(); 
                   outImage2.flush();
                   outImage = outImage2;
               }else {
                   outg.drawString(productName, 200  - strWidth/2 , image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 ); //画文字 
               }
               outg.dispose(); 
               outImage.flush();
               image = outImage;
           }
           logo.flush();
           image.flush();
           ByteArrayOutputStream baos = new ByteArrayOutputStream();
           baos.flush();
           /*ImageIO.write(image, "png", baos);

           //二维码生成的路径，但是实际项目中，我们是把这生成的二维码显示到界面上的，因此下面的折行代码可以注释掉
           //可以看到这个方法最终返回的是这个二维码的imageBase64字符串
           //前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/>  其中${imageBase64QRCode}对应二维码的imageBase64字符串
           ImageIO.write(image, "png", new File("D:/2weima/TDC-" + new Date().getTime() + "test.png")); //TODO  

           String imageBase64QRCode =  Base64.encodeBase64URLSafeString(baos.toByteArray());*/

           baos.close();
           return image;
       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
       return null;
   }


   /**
    * 构建初始化二维码
    *
    * @param bm
    * @return
    */
   public BufferedImage fileToBufferedImage(BitMatrix bm)
   {
       BufferedImage image = null;
       try
       {
           int w = bm.getWidth(), h = bm.getHeight();
           image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

           for (int x = 0; x < w; x++)
           {
               for (int y = 0; y < h; y++)
               {
                   image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);
               }
           }

       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
       return image;
   }

   /**
    * 生成二维码bufferedImage图片
    *
    * @param content
    *            编码内容
    * @param barcodeFormat
    *            编码类型
    * @param width
    *            图片宽度
    * @param height
    *            图片高度
    * @param hints
    *            设置参数
    * @return
    */
   public BufferedImage getQR_CODEBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height, Map<EncodeHintType, ?> hints)
   {
       MultiFormatWriter multiFormatWriter = null;
       BitMatrix bm = null;
       BufferedImage image = null;
       try
       {
           multiFormatWriter = new MultiFormatWriter();
           // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
           bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
           
           bm = updateBit(bm,magin430);//设置二维码margin
           
           int w = bm.getWidth();
           int h = bm.getHeight();
           image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

           // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
           for (int x = 0; x < w; x++)
           {
               for (int y = 0; y < h; y++)
               {
                   image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
               }
           }
       }
       catch (WriterException e)
       {
           e.printStackTrace();
       }
       return image;
   }
   
   private BitMatrix updateBit(BitMatrix matrix, int margin){
       int tempM = margin*2;
      int[] rec = matrix.getEnclosingRectangle();   //获取二维码图案的属性
           int resWidth = rec[2] + tempM;
           int resHeight = rec[3] + tempM;
           BitMatrix resMatrix = new BitMatrix(resWidth, resHeight); // 按照自定义边框生成新的BitMatrix
           resMatrix.clear();
       for(int i= margin; i < resWidth- margin; i++){   //循环，将二维码图案绘制到新的bitMatrix中
           for(int j=margin; j < resHeight-margin; j++){
               if(matrix.get(i-margin + rec[0], j-margin + rec[1])){
                   resMatrix.set(i,j);
               }
           }
       }
        return resMatrix;
   }

   /**
    * 设置二维码的格式参数
    *
    * @return
    */
   public Map<EncodeHintType, Object> getDecodeHintType()
   {
       // 用于设置QR二维码参数
       Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
       // 设置QR二维码的纠错级别（H为最高级别）具体级别信息
       hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
       // 设置编码方式
       hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
       hints.put(EncodeHintType.MARGIN, 0);
       hints.put(EncodeHintType.MAX_SIZE, 350);
       hints.put(EncodeHintType.MIN_SIZE, 100);

       return hints;
   }
}  
   class LogoConfig
   {
       // logo默认边框颜色
       public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
       // logo默认边框宽度
       public static final int DEFAULT_BORDER = 2;
       // logo大小默认为照片的1/5
       public static final int DEFAULT_LOGOPART = 5;

       private final int border = DEFAULT_BORDER;
       private final Color borderColor;
       private final int logoPart;

       /**
        * Creates a default config with on color {@link #BLACK} and off color
        * {@link #WHITE}, generating normal black-on-white barcodes.
        */
       public LogoConfig()
       {
           this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
       }

       public LogoConfig(Color borderColor, int logoPart)
       {
           this.borderColor = borderColor;
           this.logoPart = logoPart;
       }

       public Color getBorderColor()
       {
           return borderColor;
       }

       public int getBorder()
       {
           return border;
       }

       public int getLogoPart()
       {
           return logoPart;
       }
   }


